I don't know if it's the same for all versions of Tsukihime, (I have the very first version) but here goes.
There's 7 files in the CD
1 resource folder with icons and install background pictures
1 tsukihime folder with all the game on it
1 autorun file
1 install file
1 link to Type moon homepage (wow, this really is an old link on mine)
1 readme text file
1 staff comment text file

Could be Colorful Moon Disc, a Melty Blood promotion CD. And I seem to recall there was a Melty Blood demo disc as well, though I could be mistaken about that. It could also be something else alltogether, perhaps some of the more serious fanboys here can help you out. As far as I know, a Tsukihime demo wasn't ever released.

Ark wrote:Ok thanks. I was wondering because the CD I have doesn't seem to be Tsukihime... I've installed it and the game is pretty much a trial of some sort. If this isn't Tsukihime, what is it?

Yes, you got gipped and ripped, but it's not a trial. The version you have is Tsuki no Sabaki, which is a totally different game (Never played it, so don't ask how it is). How do I know this? I'm psychic. Oh, stay out of my wrath, Ark.

"If you understand the human mind not, all your understanding are for naught."